5, including 2 doctors, charged in Matthew Perry’s death investigation; 2 plead not guilty WLS-TVMatthew Perry death investigation: Actor’s assistant, doctors among 5 charged in his ketamine overdose Yahoo EntertainmentDOJ Says Doctors Arrested for Matthew Perry Drug Death Allegedly Texted: ‘Wonder How Much This Moron Will Pay’ PEOPLEMatthew Perry’s Assistant and Doctors Charged With Getting Him Ketamine The New York Times